Going all the way back to the starter thread.
The absorbtion refrigerator
does not make your beer cold by making frost. If it is making a lot of frost it usually indicates that your door seal is leaking air and, in that case, it will never get really cold. In fact, just like in your old home refrigerator
, frost on the cooling coils actually reduced the efficiency of the refrigerator
The Model; 23 was the original refrigerator in your Boler
, I had the same one in my 1973 Hunter until recently and it worked fine until I pulled it for one with more inside space but, that said, I hardly ever saw any frost on the freezer section.
I suggest that you look at the seal around the door and also check and see if the door itself might be warped. Go around the edge of the door and if you can easily slide a 3x5" card in between the door seal and the case, air can get by as well.
What else helps is to use extra latches on the door, one at the top and one at the bottom, to keep is sealed when closed.
But also keep in mind, it is 40+ years old and was very sensitive to be running out of level over it's life.